sony handheld tv
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Maniac_Man
- Posts: 185
- Joined: Wed Feb 02, 2005 4:26 pm
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sony handheld tv
ok, i would like to do the led hack in my tv for my portable genesis, could some body tell me how many ohms it would take to reduce 4.5v to 3v?
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nos_slived
- Higher Idiot
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Depends what current you want.
Use the formula:
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Use the formula:
Thanks to PoD and Stereth for the formula (because I didn't feel like typing all thatPoD wrote:R = (Vs - Vf)/I,
where R is the resistor value, Vs is supply voltage, Vf is forward voltage (LED spec), and I is the desired current. Try a couple different values for the resistor, up to the max current for the LEDs. Remember, the current from that equation is total current for the 3 LEDs. Use the 7.2V supply, not the cathode power supply.
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